Atest cross was made between true-breeding eeww flies and eeww flies. the resulting f1 generation was then crossed with eeww flies. 100 offspring in the f2 generation were examined, and it was discovered that the e and w genes were not linked. which is the correct genotype of the f2 offspring if the genes were linked and if the genes were not linked?

Explanation:

Parental cross: EW/EW X ew/ew

F1 genotype: EW/ew

F1 Gametes:

- Parentals (more abundant): EW and ew

- Recombinant (less abundant): Ew and eW

Test cross: EW/ew X ew/ew

F2 genotypes:

Parental cross: EEWW X eeww

F1 genotype: EeWw

F1 gametes: EW, Ew, eW, ew. Genes assort independently, so all of the possible gametes of the F1 individual will have the same probability.

Test cross: EeWw X eeww

F2 genotypes:

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

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